How to use information from another when adding (updating) one WordPress post?

Question

WordPress

I have a custom record type "Banks". It has an arbitrary metafield "Name".
There is an arbitrary record type "Maps". When adding a card, you should select a bank from existing banks.
How to implement it?

Answer 1

One of the Relationship Fields in the ACF plugin (or equivalents, almost everyone has it).
Custom metabox into which we pull jars using WP_Query.

Answer 2

If you have a Map at the forefront, you can make the Bank a taxonomy of the Map. In this case, you will not need ACF, and you can also safely change the name and other parameters of the bank)